Recording paper locking device



y 1939- R. R. CHAPPELL ET AL 2,157,417

RECORDING PAPER LOCKING DEVICE Filed July 11, 1936 IN VENTOR.

RALPH R. CHAPPELL BY RUTGER a. COLT Patented July 25, 1939 UNITED STATES2,167,417 nnoonn'mo. PAPER LOCKING DEVICE Ralph R. Chappell, Richmond,-Va., and Rutger B. Colt, Baltimore, Md., assignors to Bendix AviationCorporation, South Bend, Ind., a corporation of Delaware ApplicationJuly 11, 1936, Serial No. 90,226

16 Claims.

This invention relates to paper holding apparatus, such as may beemployed in connection with recording mechanisms, and more particularlyto means for mounting and securing record 5 sheets or charts.

One of the objects of the'present invention is to provide novel meansfor securing chart record paper to cylindrical drums, or othersupporting means therefor.

Means have been heretofore provided for securing record sheets oncylindrical supporting members but considerable skill and practice inapplying and fastening said record sheet thereto is required if a firmapplication of the same and lb accurate recording results are to beobtained.

Additionally, the fastening means heretofore provided on devices of thischaracter have not been entirely reliable insofar as holding the sheettaut and in proper position is concerned, and the same it oftennecessitates the mutilation of the ends of the paper sheet or otherrecording surface. It is also extremely difficult with the meansheretofore provided to replace the record sheet on the drum in the samerelative position in which the same was previously applied.

It is accordingly another object of the invention to provide novelapparatus whereby a record sheet may be readily secured to and removedfrom a cylindrical drum without the exercise of special aging saidsheet. i

Still another object is to provide novel mounting means for a recordchart, which means is 36 extremely reliable in use.

whereby a flexible member may be held in close engagement with a curvedsupporting or backing plate and under tension thereon so that the same4,0 may be removed from said plate and readily replaced thereon anindefinite number of times in the same relative position with respect tothe supporting plate.

The above and further objects and novel features of the invention willmore fully appear from the following detailed description when taken inconnection with the accompanying drawing. It is to be expresslyunderstood, however, that the drawing is for the purpose of illustrationonly and 50 are not designed as a definition of the limits of theinvention, reference being primarily had for this latter purpose to theappended claims.

In the drawing wherein like reference character refer to like partsthroughout the several views:

' of a'pair of end plates I2 and I3.

skill and without in any way multiating or damthe length of plate II inthe direction of curva simple, both in construction and operation, andis A further object is to provide novel means (Cl. fill-415.1)

Figs. 1 to 4, inclusive, are isometric views, illustrating the variouselements of one embodiment of the invention, said figures constituingwhat may be termed an explosive view; and,

Figs. 5 and 6 are cross sectional end views of 5 the assembled device,showing the internal structure of the same in unlocked and lockedposition, respectively, the sections being taken at right angles to theaxis of the supporting drum.

The single embodiment of the present inven- 10 tion' is illustrated, byway of example, in the drawing in the form of a cylindrical member onwhich a record sheet or chart is adapted to be secured by novel meansmounted within the drum, saidnovel means being adapted to yieldinglyclamp the ends of the record sheet against the inner wall of said drumand to frictionally hold said ends against withdrawal. Said means alsoassists in pulling the record sheet taut on the drum so as to insure theproduction of an accurate recordation.

In the specific form of theinvention shown, the supporting means for arecord sheet In of any suitable material, such as paper,is' constitutedby a hollow drum which is fabricated from a sheet metal plate I I thatis bent to the desired curvature and secured by means of a plurality ofsmall screws to theflange portions |2a and [3a Said flange portions aresplit as shown at l2 and I3, and

ture is slightly less than the perpihery of said flanges so that theedges thereof, which are preferably bevelled, do not meet but coincidewith the edges ofslots l2 and 13', thereby forming a longi tudinal slotH in the surface of the fabricated drum.

Novel locking means adapted to be housed within drum II are comprehendedby the present invention, whereby record sheet III, which surrounds thedrum and has the ends thereof extending into slot 14, may be quickly andtautly applied thereto without fuss or special skill, and whereby thesame record sheet or chart may be applied to the drum an indefinitenumber of times inthe same relative position on the drum without anydetrimental or damaging effects whatever on the paper or. chart. Saidnovel means assists the operator in tautly applying the record sheet andlocks the same in position without danger of the same becoming looseduring operation or use. In the form shown, said lockingmeans areconsttiuted by an assembly or internal structure comprising a pair ofsubstantially equilateral triangular plates 1 5 and I6 secured to uopposite ends of a hollow shaft or member I! and, if desired, similarintermediate plates may be provided. Extending between said plates, andmounted thereon adjacent the apices thereof and parallel to the axis ofdrum H, are a pair of rotatably mounted tie rods l8, l8 and a third tierod l9, which is fixed against rotation relative to plates l5, 18. Oneor more cylindrical members '20 are mounted on each of said tie rods,said members being preferably constructed of some yielding or resilientmaterial, such as rubber, for example, between which and the materialused as a recording sheet the coeiflcient of friction is comparativelyhigh. The diameter of member 20 is such that the peripheral surface ofeach of the same engages the inner surface of drum ll. Hence, when thelocking assembly is inserted in drum II, the same will be yieldinglysupported therein for rotation relative thereto. Members 20 are tightlyfitted on tie rods l8 and I9, or fixed thereto in any suitable manner toprevent relative rotation therebetween, so that when the lockingassembly is rotated relative to drum ll, members 20 on rod l9 areadapted to slidably and frictionally engage the inner surface of thedrum or the ends of sheet ill, in a manner and for a purpose to be morefully pointed out hereafter.

Means are provided for limiting the movement of the above describedlocking means in drum l I, and means are also provided, exterior of saiddrum, for actuating the locking assembly through the limited range ofmovement thereof. Said means, in the form illustrated, comprise aplurality of arcuate slots or openings 2i in end plate 12 of thesupporting drum, the center of curvature of said arcuate openingscoinciding with the longitudinal axis of the drum. A plurality of posts22 are mounted on and extend axially from plate l5 of the lockingassembly and are so positioned thereon as to extend through arcuateopenings 2| for sliding movement therein. Posts 22 also extend through adisk member 23 which has a slightly greater diameter than drum ll. Saiddisk is held on posts 22 and in sliding engagement with end plate l2 bymeans of nuts 24 which are threaded onto the outer, threaded ends ofsaid posts. It will thus be seen that, by holding drum H stationary androtating disk 23, the

internal structure or looking assembly of Fig. 3

may be arcuately moved a distance determined by the length of openings2|. For the purpose of aiding the operator in holding drum l Istationary to permit actuation of the locking assembly, end plate l3also has a slightly larger diameter than drum II and the peripherythereof is knurled, as is also the periphery of disk 23.

In the embodiment of the invention shown, the collars or unthreadedportions of posts 22 are substantially equal to'or slightly greater thanthe combined thicknesses of plate l2 and disk 23, so that nuts 24 willtighten against the shoulder on said posts and exert no pressure on thedisk. By reducing the length of one or more of the unthreaded portionsof posts 22, it will be seen that pressure may be exerted, by one ormore of nuts 24, to thereby hold disk 23 in frictional engagement withplate l2 and accordingly hold the looking assembly in any desiredposition within the range of movement thereof. Special means areprovided, however, for this latter purpose and in the illustrated formcomprise a threaded stud 25 rigidly secured to and extending axiallyfrom end plate l2 through an arcuate slot 26 in disk '23, A wing nut 21adapted to be threadedly received by stud 25 may be screwed intofrictional engagement with disk 23 and thus hold the internal lockingassembly in the desired position.

In assembling the elements illustrated in Figs. 1 to 4, inclusive, thelocking assembly of Fig. 3 is inserted into drum 1 l--I 3 with posts 22extending through openings 2 i, so that the non-rotatable tie rod I9 isadjacent slot l4 and movable from one side thereof to the other infrictional engagement with the inner surface of the drum. Disk 23 isthen secured on the projecting ends of posts 22 by means of nuts 24, andend plate I3 is secured in the opposite end of the drum by means of setscrews, the relative positions of "said plate and drum being such thatslot l3 coincides with longitudinal slot ll.

In order to apply record sheet [0 to "-43, said sheet is preferablyprefolded at one end and said prefclded portion Illa is inserted intoslot H, as seen in Fig. 5. The remainder of sheet i0 is curled aroundthe drum and the opposite end lllb thereof also inserted into slot I. Asthe locking assembly is then rotated in a counterclockwise direction, asviewed in Fig. 5, member 20 'on rod l9 slldably and frictionally engageend [0b of the record sheet, and as said member moves across slot II,the same is effective to frictionally pull sheet Ill taut and clamp endsIlla and "lb against the inner wall of drum ll-l3, members 20 beingadapted to yield for accommodating the thicknesses of said ends. Theparts are shown in looking position in Fig. 6. If sheet I0 is removedand it is desired to mount the same again, the pre-folded portion Illamay be reinserted into slot l4 and the sheet locked in position in theabove manner in the same relative position on drum Il-l3 in which it waspreviously applied.

In order that the above described device may be rotatably or otherwisesuitably mounted, such as for use in recording apparatus, end plates l2and H are provided with centrally positioned bosses or bearings whichare adapted to engage a rotatable shaft or other suitable supportingmeans (not shown).

There is thus provided novel means for looking a sheet of flexiblematerial, such as a paper record chart, on a cylindrical drum or othersuitable supporting member, whereby said chart may be readily andqulcklyapplied and locked in position on said drum by any ordinary mechanic.The novel paper locking means provided also assists in drawing the charttaut and in close engagement with the outer surface of the drum, andreliably maintains the same in taut position without damaging the paper.Additionally. with the novel fastening means provided hereby, a recordsheet may be secured on a supporting surface in the same relativeposition an indefinite ercise of any special skill. The device providedis also extremely simple both in construction and I operation, the samecomprising only a small number of comparatively ru ged parts, therebyreducing the probability of failure to a minimum.

Although only a. single embodiment of the invention has been illustratedand described in detail, it is to be expressly understood that the sameis not limited thereto, but that various changes may be made in thedesign and arrangement of parts illustrated without departing from thespirit and scope of the invention, as will now be readily understood bythose skilled in the art. For a definition of the limits of theinvention, reference will be had primarily to the appended claims.

spaced members, each of said members bearing against said drum andmovably supported by the internal surface thereof, and means forrelatively rotating said locking means and drum.

2. In apparatus of the class described, a hollow drum having alongitudinal slot in the surface thereof, locking means within said drumcomprising a skeleton structure having a plurality of spaced members,each of said members bearing against said drum and movably supported bythe internal surface thereof, means for relatively rotating said lockingmeans and drum, and means for limiting said relative movement in twodirections.

3. In apparatus of the class described, a cylindrical supporting memberhaving a longitudinal slot therein, locking means in said membercomposed of yielding material and adapted to frictionally engage theinner surface thereof, and means for moving said locking means relativeto said slot.

4. In apparatus of the class described, a cylindrical supporting memberhaving a longitudinal slot therein, locking means in said membercomposed of yielding material and adapted to frictionally engage theinner surface thereof, means for moving said locking means relative tosaid slot, and means for limiting said relative move ment.

5. In apparatus of the class described, a cylindrical supporting memberhaving a longitudinal slot therein, locking means in said membercomposed of yielding material and adapted to frictionally engage theinner surface thereof, means for moving said locking means relative tosaid slot, and releasable means for holding said member and yieldablemeans against relative movement.

6. In apparatus of the class described, a cylindrical supporting memberhaving a longitudinal slot therein, yieldable means in said memberadapted to frictionally engage the inner surface thereof, means formoving said yieldable means relative to said slot, means for limitingsaid relative movement, and releasable means for holding said member andyieldable means against relative movement.

'7. In apparatus of the class described, a supporting member having aslot therein, locking means composed of yielding material frictionallyengaging a surface of said member adjacent said slot, means for movingsaid locking means across said slot, and means for limiting the movementof said yieldable means relative to the supporting member.

8. In apparatus of the class described, supporting means having a slottherein, a member composed of yielding material adapted to frictionallyyieldingly engage a surface of said means adjacent said slot, means formoving said member relative to said slot, and releasable means forholding said supporting means and member against such relative movement.

9. In apparatus of the class described, supporting means having a slottherein, a member having a surface concentrically disposed throughoutits extent and adapted to frictionally engage a surface of saidsupporting means adjacent said slot, means for moving said memberrelative to said slot, releasable means for holding said supportingmeans and member against such relative movement, and means for limitingsaid relative movement.

10. In apparatus of the class described, a hollow drum having alongitudinal slot therein, a record sheet surrounding said drum andhaving the ends thereof extending through said slot, and resilientlyconstructed means comprising a skeleton member within said drum foryieldingly holding the ends of said sheet against the inner wall of saiddrum.

11. In apparatus of the class described, a hollow drum having a slot inthe surface thereof, a sheet of flexible material surrounding said drumwith the ends thereof extending through said slot, an angularly movablemember in said drum, comprising yielding means, and means for movingsaid member to yieldingly clamp the ends of said sheet between saidmember and the wall of said drum.

12. In apparatus of the class described, a hollow drum having a slot inthe surface thereof, a sheet of flexible material extending around saiddrum with the ends thereof extending through said slot, and resilientlyconstructed means within said hollow drum coacting with said drum forfrictionally holding the ends of said sheet against withdrawal.

13. In apparatus of the class described, a hollow drum having a slot inthe surface thereof, a sheet of flexible material surrounding said drumand having the ends thereof extending through said slot, and yieldinglocking means movably supported in said drum comprising a frictionmember slidably engaging the inner surface of said drum and adapted toclamp the ends of said sheet against said inner surface.

14. In apparatus of the class described, a drum comprising a pair offlanged end plates and a sheet metal plate secured to the flanges ofsaid end plates, said drum having a. longitudinal slot in the surfacethereof and a plurality of arcuate openings in one end thereof, thecenters of ourvature of said openings coinciding with the longitudinalaxis of said drum, locking means in said drum comprising a plurality oftriangular plates, a pair of rotatable tie rods joining opposed verticesof said triangular plates, a third tie rod joining the other verticesand fixed against movement relative to said triangular plates, resilientmeans on each of said tie rods engaging the internal surface of saiddrum and a plurality of pins secured to and extending axially from oneof said triangular plates and through said arcuate openings, a diskhaving openings therein for receiving said pins, and means for securingsaid disk on the latter, whereby said locking means may be rotatedthrough a limited arcuate distance relative to said drum. 15. Inapparatus of the class described, a sheet metal drum having alongitudinal slot in the surface thereof and a plurality of arcuateopenings in one end thereof, locking means in said drum comprising apair of parallel end plates, a pair of rods rotatably journalled in saidend plates, resilient sleeves mounted on each of said rods and engagingthe internal surface of said drum and a plurality of axially extendingposts on one of said end plates, a disk exterior of said drum and havingopenings therein, said posts being adapted to extend through saidarcuate openings and the openings in said disk, whereby said lockingmeans may be rotated through a limited arcuate distance relative to saiddrum.

16. In apparatus of the class described, a hollow drum havin: alongitudinal slot in the surface thereof and an ercunte opening in oneend,

,the center of curvature of said arcuate opening ly engage the innerwell of said drum adiaeent said slot, a. post on one of said platesadepted to extend through .said arcunte openinu. and means secured onsaid poet exterior of the drum for actuating said iockinz assanbly.

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